This is the issue I was describing earlier, regarding the purple textures:
I'm glad I'm not the only one encountering this. I fought a dragon last night that was all purple, like those in the video. It's ridiculous. From what I've read, it sounds like the purple is a placeholder for textures that fail to load properly, which would explain why restarting the game tends to resolve it. I hope they address this.
It was the same in Oblivion as well.
Purple for missing textures, and three dimensional exclamation marks for missing meshes.
The purple textures happened to me once, I saved my game, reloaded, and they were gone...